Control device for ac rotating machine, and electric power-steering device

A control device for an AC rotating machine, comprising:

• an inverter configured to apply a voltage to the AC rotating machine;
• a DC power supply configured to supply DC power to the inverter;
• an electric current detector configured to detect a rotating machine electric current flowing through the AC rotating machine;
• a first axis voltage command value calculator configured to calculate a voltage command value of a first axis between two rotational axes of the AC rotating machine;
• and
• a second axis voltage command value calculator configured to calculate a voltage command value of a second axis between the two rotational axes,
• wherein the first axis voltage command value calculator calculates the voltage command value of the first axis based on
• a corrected first deviation obtained by multiplying, by a correction gain, a first deviation that is a deviation between an electric current command value of the first axis and a detected electric current value of the first axis of the rotating machine electric current,
• a second deviation that is a deviation between an electric current command value of the second axis and a detected electric current value of the second axis of the rotating machine electric current, and
• a rotational angular velocity of the AC rotating machine, and
• wherein a set value of the correction gain is increased when a physical quantity in the AC rotating machine has rapidly changed or when an output voltage of the DC power supply has increased.